Sock



FIG. 1 is a right side elevational view of a sock showing our new design;

FIG. 2 is a left side elevational view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a bottom plan view thereof;

FIG. 5 is a front elevational view thereof; and

FIG. 6 is a rear elevational thereof. 

The ornamental design for a sock, as shown and described. 